/
live-helpers
1540 lines (1330 loc) · 32.7 KB
/
live-helpers
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# live-boot helper functions, used by live-boot on boot and by live-snapshot
if [ ! -x "/bin/fstype" ]
then
# klibc not in path -> not in initramfs
export PATH="${PATH}:/usr/lib/klibc/bin"
fi
# handle upgrade path from old udev (using udevinfo) to
# recent versions of udev (using udevadm info)
if [ -x /sbin/udevadm ]
then
udevinfo='/sbin/udevadm info'
else
udevinfo='udevinfo'
fi
root_overlay_label="full-ov"
old_root_overlay_label="live-rw"
old_home_overlay_label="home-rw"
custom_overlay_label="custom-ov"
root_snapshot_label="live-sn"
old_root_snapshot_label="live-sn"
home_snapshot_label="home-sn"
persistence_list="live.persist"
Arguments ()
{
PRESEEDS=""
LOCATIONS=""
for ARGUMENT in $(cat /proc/cmdline)
do
case "${ARGUMENT}" in
skipconfig)
NOACCESSIBILITY="Yes"
NOFASTBOOT="Yes"
NOFSTAB="Yes"
NONETWORKING="Yes"
export NOACCESSIBILITY NOFASTBOOT NOFSTAB NONETWORKING
;;
access=*)
ACCESS="${ARGUMENT#access=}"
export ACCESS
;;
console=*)
DEFCONSOLE="${ARGUMENT#*=}"
export DEFCONSOLE
;;
BOOTIF=*)
BOOTIF="${x#BOOTIF=}"
;;
debug)
DEBUG="Yes"
export DEBUG
set -x
;;
dhcp)
# Force dhcp even while netbooting
# Use for debugging in case somebody works on fixing dhclient
DHCP="Force";
export DHCP
;;
nodhcp)
unset DHCP
;;
ethdevice=*)
DEVICE="${ARGUMENT#ethdevice=}"
ETHDEVICE="${DEVICE}"
export DEVICE ETHDEVICE
;;
ethdevice-timeout=*)
ETHDEV_TIMEOUT="${ARGUMENT#ethdevice-timeout=}"
export ETHDEV_TIMEOUT
;;
fetch=*)
FETCH="${ARGUMENT#fetch=}"
export FETCH
;;
forcepersistentfsck)
FORCEPERSISTENTFSCK="Yes"
export FORCEPERSISTENTFSCK
;;
ftpfs=*)
FTPFS="${ARGUMENT#ftpfs=}"
export FTPFS
;;
httpfs=*)
HTTPFS="${ARGUMENT#httpfs=}"
export HTTPFS
;;
iscsi=*)
ISCSI="${ARGUMENT#iscsi=}"
#ip:port - separated by ;
ISCSI_PORTAL="${ISCSI%;*}"
if echo "${ISCSI_PORTAL}" | grep -q , ; then
ISCSI_SERVER="${ISCSI_PORTAL%,*}"
ISCSI_PORT="${ISCSI_PORTAL#*,}"
fi
#target name
ISCSI_TARGET="${ISCSI#*;}"
export ISCSI ISCSI_PORTAL ISCSI_TARGET ISCSI_SERVER ISCSI_PORT
;;
isofrom=*|fromiso=*)
FROMISO="${ARGUMENT#*=}"
export FROMISO
;;
ignore_uuid)
IGNORE_UUID="Yes"
export IGNORE_UUID
;;
integrity-check)
INTEGRITY_CHECK="Yes"
export INTEGRITY_CHECK
;;
ip=*)
STATICIP="${ARGUMENT#ip=}"
if [ -z "${STATICIP}" ]
then
STATICIP="frommedia"
fi
export STATICIP
;;
live-getty)
LIVE_GETTY="1"
export LIVE_GETTY
;;
live-media=*|bootfrom=*)
LIVE_MEDIA="${ARGUMENT#*=}"
export LIVE_MEDIA
;;
live-media-encryption=*|encryption=*)
LIVE_MEDIA_ENCRYPTION="${ARGUMENT#*=}"
export LIVE_MEDIA_ENCRYPTION
;;
live-media-offset=*)
LIVE_MEDIA_OFFSET="${ARGUMENT#live-media-offset=}"
export LIVE_MEDIA_OFFSET
;;
live-media-path=*)
LIVE_MEDIA_PATH="${ARGUMENT#live-media-path=}"
export LIVE_MEDIA_PATH
;;
live-media-timeout=*)
LIVE_MEDIA_TIMEOUT="${ARGUMENT#live-media-timeout=}"
export LIVE_MEDIA_TIMEOUT
;;
module=*)
MODULE="${ARGUMENT#module=}"
export MODULE
;;
netboot=*)
NETBOOT="${ARGUMENT#netboot=}"
export NETBOOT
;;
nfsopts=*)
NFSOPTS="${ARGUMENT#nfsopts=}"
export NFSOPTS
;;
nfscow=*)
NFS_COW="${ARGUMENT#nfscow=}"
export NFS_COW
;;
noaccessibility)
NOACCESSIBILITY="Yes"
export NOACCESSIBILITY
;;
nofastboot)
NOFASTBOOT="Yes"
export NOFASTBOOT
;;
nofstab)
NOFSTAB="Yes"
export NOFSTAB
;;
nonetworking)
NONETWORKING="Yes"
export NONETWORKING
;;
ramdisk-size=*)
ramdisk_size="${ARGUMENT#ramdisk-size=}"
;;
swapon)
SWAPON="Yes"
export SWAPON
;;
persistent)
PERSISTENT="Yes"
export PERSISTENT
;;
persistent-encryption=*)
PERSISTENT_ENCRYPTION="${ARGUMENT#*=}"
export PERSISTENT_ENCRYPTION
;;
persistent-media=*)
PERSISTENT_MEDIA="${ARGUMENT#*=}"
export PERSISTENT_MEDIA
;;
persistent-method=*)
PERSISTENT_METHOD="${ARGUMENT#*=}"
export PERSISTENT_METHOD
;;
persistent-path=*)
PERSISTENT_PATH="${ARGUMENT#persistent-path=}"
export PERSISTENT_PATH
;;
persistent-read-only)
PERSISTENT_READONLY="Yes"
export PERSISTENT_READONLY
;;
persistent-storage=*)
PERSISTENT_STORAGE="${ARGUMENT#persistent-storage=}"
export PERSISTENT_STORAGE
;;
persistent-subtext=*)
root_overlay_label="${root_overlay_label}-${ARGUMENT#persistent-subtext=}"
old_root_overlay_label="${old_root_overlay_label}-${ARGUMENT#persistent-subtext=}"
old_home_overlay_label="${old_home_overlay_label}-${ARGUMENT#persistent-subtext=}"
custom_overlay_label="${custom_overlay_label}-${ARGUMENT#persistent-subtext=}"
root_snapshot_label="${root_snapshot_label}-${ARGUMENT#persistent-subtext=}"
old_root_snapshot_label="${root_snapshot_label}-${ARGUMENT#persistent-subtext=}"
home_snapshot_label="${home_snapshot_label}-${ARGUMENT#persistent-subtext=}"
;;
nopersistent)
NOPERSISTENT="Yes"
export NOPERSISTENT
;;
noprompt)
NOPROMPT="Yes"
export NOPROMPT
;;
noprompt=*)
NOPROMPT="${ARGUMENT#noprompt=}"
export NOPROMPT
;;
quickusbmodules)
QUICKUSBMODULES="Yes"
export QUICKUSBMODULES
;;
preseed/file=*|file=*)
LOCATIONS="${ARGUMENT#*=} ${LOCATIONS}"
export LOCATIONS
;;
nopreseed)
NOPRESEED="Yes"
export NOPRESEED
;;
*/*=*)
question="${ARGUMENT%%=*}"
value="${ARGUMENT#*=}"
PRESEEDS="${PRESEEDS}\"${question}=${value}\" "
export PRESEEDS
;;
showmounts)
SHOWMOUNTS="Yes"
export SHOWMOUNTS
;;
silent)
SILENT="Yes"
export SILENT
;;
todisk=*)
TODISK="${ARGUMENT#todisk=}"
export TODISK
;;
toram)
TORAM="Yes"
export TORAM
;;
toram=*)
TORAM="Yes"
MODULETORAM="${ARGUMENT#toram=}"
export TORAM MODULETORAM
;;
exposedroot)
EXPOSED_ROOT="Yes"
export EXPOSED_ROOT
;;
plainroot)
PLAIN_ROOT="Yes"
export PLAIN_ROOT
;;
skipunion)
SKIP_UNION_MOUNTS="Yes"
export SKIP_UNION_MOUNTS
;;
root=*)
ROOT="${ARGUMENT#root=}"
export ROOT
;;
union=*)
UNIONTYPE="${ARGUMENT#union=}"
export UNIONTYPE
;;
esac
done
# sort of compatibility with netboot.h from linux docs
if [ -z "${NETBOOT}" ]
then
if [ "${ROOT}" = "/dev/nfs" ]
then
NETBOOT="nfs"
export NETBOOT
elif [ "${ROOT}" = "/dev/cifs" ]
then
NETBOOT="cifs"
export NETBOOT
fi
fi
if [ -z "${MODULE}" ]
then
MODULE="filesystem"
export MODULE
fi
if [ -z "${UNIONTYPE}" ]
then
UNIONTYPE="aufs"
export UNIONTYPE
fi
if [ -z "${PERSISTENT_ENCRYPTION}" ]
then
PERSISTENT_ENCRYPTION="none"
export PERSISTENT_ENCRYPTION
elif echo ${PERSISTENT_ENCRYPTION} | grep -qe "\<luks\>"
then
if ! modprobe dm-crypt
then
log_warning_msg "Unable to load module dm-crypt"
PERSISTENT_ENCRYPTION=$(echo ${PERSISTENT_ENCRYPTION} | sed -e 's/\<luks,\|,\?luks$//g')
export PERSISTENT_ENCRYPTION
fi
if [ ! -x /lib/cryptsetup/askpass ] || [ ! -x /sbin/cryptsetup ]
then
log_warning_msg "cryptsetup in unavailable"
PERSISTENT_ENCRYPTION=$(echo ${PERSISTENT_ENCRYPTION} | sed -e 's/\<luks,\|,\?luks$//g')
export PERSISTENT_ENCRYPTION
fi
fi
if [ -z "${PERSISTENT_METHOD}" ]
then
PERSISTENT_METHOD="snapshot,overlay"
export PERSISTENT_METHOD
fi
if [ -z "${PERSISTENT_STORAGE}" ]
then
PERSISTENT_STORAGE="filesystem,file"
export PERSISTENT_STORAGE
fi
}
sys2dev ()
{
sysdev=${1#/sys}
echo "/dev/$($udevinfo -q name -p ${sysdev} 2>/dev/null|| echo ${sysdev##*/})"
}
subdevices ()
{
sysblock=${1}
r=""
for dev in "${sysblock}"/* "${sysblock}"
do
if [ -e "${dev}/dev" ]
then
r="${r} ${dev}"
fi
done
echo ${r}
}
storage_devices()
{
black_listed_devices="${1}"
white_listed_devices="${2}"
for sysblock in $(echo /sys/block/* | tr ' ' '\n' | grep -vE "loop|ram|fd")
do
fulldevname=$(sys2dev "${sysblock}")
if echo "${black_listed_devices}" | grep -qe "\<${fulldevname}\>" || \
[ -n "${white_listed_devices}" ] && \
echo "${white_listed_devices}" | grep -qve "\<${fulldevname}\>"
then
# skip this device entirely
continue
fi
for dev in $(subdevices "${sysblock}")
do
devname=$(sys2dev "${dev}")
if echo "${black_listed_devices}" | grep -qe "\<${devname}\>"
then
# skip this subdevice
continue
else
echo "${devname}"
fi
done
done
}
is_supported_fs ()
{
fstype="${1}"
# Validate input first
if [ -z "${fstype}" ]
then
return 1
fi
# Try to look if it is already supported by the kernel
if grep -q ${fstype} /proc/filesystems
then
return 0
else
# Then try to add support for it the gentle way using the initramfs capabilities
modprobe ${fstype}
if grep -q ${fstype} /proc/filesystems
then
return 0
# Then try the hard way if /root is already reachable
else
kmodule="/root/lib/modules/`uname -r`/${fstype}/${fstype}.ko"
if [ -e "${kmodule}" ]
then
insmod "${kmodule}"
if grep -q ${fstype} /proc/filesystems
then
return 0
fi
fi
fi
fi
return 1
}
get_fstype ()
{
/sbin/blkid -s TYPE -o value $1 2>/dev/null
}
where_is_mounted ()
{
device=${1}
# return first found
grep -m1 "^${device} " /proc/mounts | cut -f2 -d ' '
}
trim_path () {
# remove all unnecessary /:s in the path, including last one (except
# if path is just "/")
echo ${1} | sed 's|//\+|/|g' | sed 's|^\(.*[^/]\)/$|\1|'
}
what_is_mounted_on ()
{
local dir="$(trim_path ${1})"
grep -m1 "^[^ ]\+ ${dir} " /proc/mounts | cut -d' ' -f1
}
lastline ()
{
while read lines
do
line=${lines}
done
echo "${line}"
}
base_path ()
{
testpath="${1}"
mounts="$(awk '{print $2}' /proc/mounts)"
testpath="$(busybox realpath ${testpath})"
while true
do
if echo "${mounts}" | grep -qs "^${testpath}"
then
set -- $(echo "${mounts}" | grep "^${testpath}" | lastline)
echo ${1}
break
else
testpath=$(dirname $testpath)
fi
done
}
fs_size ()
{
# Returns used/free fs kbytes + 5% more
# You could pass a block device as ${1} or the mount point as ${2}
dev="${1}"
mountp="${2}"
used="${3}"
if [ -z "${mountp}" ]
then
mountp="$(where_is_mounted ${dev})"
if [ -z "${mountp}" ]
then
mountp="/mnt/tmp_fs_size"
mkdir -p "${mountp}"
mount -t $(get_fstype "${dev}") -o ro "${dev}" "${mountp}" || log_warning_msg "cannot mount -t $(get_fstype ${dev}) -o ro ${dev} ${mountp}"
doumount=1
fi
fi
if [ "${used}" = "used" ]
then
size=$(du -ks ${mountp} | cut -f1)
size=$(expr ${size} + ${size} / 20 ) # FIXME: 5% more to be sure
else
# free space
size="$(df -k | grep -s ${mountp} | awk '{print $4}')"
fi
if [ -n "${doumount}" ]
then
umount "${mountp}" || log_warning_msg "cannot umount ${mountp}"
rmdir "${mountp}"
fi
echo "${size}"
}
load_keymap ()
{
# Load custom keymap
if [ -x /bin/loadkeys -a -r /etc/boottime.kmap.gz ]
then
loadkeys /etc/boottime.kmap.gz
fi
}
setup_loop ()
{
local fspath=${1}
local module=${2}
local pattern=${3}
local offset=${4}
local encryption=${5}
local readonly=${6}
# the output of setup_loop is evaluated in other functions,
# modprobe leaks kernel options like "libata.dma=0"
# as "options libata dma=0" on stdout, causing serious
# problems therefor, so instead always avoid output to stdout
modprobe -q -b "${module}" 1>/dev/null
udevadm settle
for loopdev in ${pattern}
do
if [ "$(cat ${loopdev}/size)" -eq 0 ]
then
dev=$(sys2dev "${loopdev}")
options=''
if [ -n "${readonly}" ]
then
if losetup --help 2>&1 | grep -q -- "-r\b"
then
options="${options} -r"
fi
fi
if [ -n "${offset}" ] && [ 0 -lt "${offset}" ]
then
options="${options} -o ${offset}"
fi
if [ -z "${encryption}" ]
then
losetup ${options} "${dev}" "${fspath}"
else
# Loop AES encryption
while true
do
load_keymap
echo -n "Enter passphrase for root filesystem: " >&6
read -s passphrase
echo "${passphrase}" > /tmp/passphrase
unset passphrase
exec 9</tmp/passphrase
/sbin/losetup ${options} -e "${encryption}" -p 9 "${dev}" "${fspath}"
error=${?}
exec 9<&-
rm -f /tmp/passphrase
if [ 0 -eq ${error} ]
then
unset error
break
fi
echo
echo -n "There was an error decrypting the root filesystem ... Retry? [Y/n] " >&6
read answer
if [ "$(echo "${answer}" | cut -b1 | tr A-Z a-z)" = "n" ]
then
unset answer
break
fi
done
fi
echo "${dev}"
return 0
fi
done
panic "No loop devices available"
}
try_mount ()
{
dev="${1}"
mountp="${2}"
opts="${3}"
fstype="${4}"
old_mountp="$(where_is_mounted ${dev})"
if [ -n "${old_mountp}" ]
then
if [ "${opts}" != "ro" ]
then
mount -o remount,"${opts}" "${dev}" "${old_mountp}" || panic "Remounting ${dev} ${opts} on ${old_mountp} failed"
fi
mount -o bind "${old_mountp}" "${mountp}" || panic "Cannot bind-mount ${old_mountp} on ${mountp}"
else
if [ -z "${fstype}" ]
then
fstype=$(get_fstype "${dev}")
fi
mount -t "${fstype}" -o "${opts}" "${dev}" "${mountp}" || \
( echo "SKIPPING: Cannot mount ${dev} on ${mountp}, fstype=${fstype}, options=${opts}" > live-boot.log && return 0 )
fi
}
mount_persistent_media ()
{
local device=${1}
local backing=""
# We can't mount into ${rootmnt}/live before ${rootmnt} has been
# mounted since that would cover our mountpoint.
if [ -n "${rootmnt}" ] && [ -z "$(what_is_mounted_on ${rootmnt})" ]
then
backing="/$(basename ${device})-backing"
else
backing="${rootmnt}/live/persistent/$(basename ${device})"
fi
mkdir -p "${backing}"
local old_backing="$(where_is_mounted ${device})"
if [ -z "${old_backing}" ]
then
local fstype="$(get_fstype ${device})"
local mount_opts="rw,noatime"
if [ -n "${PERSISTENT_READONLY}" ]
then
mount_opts="ro,noatime"
fi
if mount -t "${fstype}" -o "${mount_opts}" "${device}" "${backing}" >/dev/null
then
echo ${backing}
return 0
else
log_warning_msg "Failed to mount persistent media ${device}"
return 1
fi
elif [ "${backing}" != "${old_backing}" ]
then
if mount --move ${old_backing} ${backing} >/dev/null
then
echo ${backing}
return 0
else
log_warning_msg "Failed to move persistent media ${device}"
return 1
fi
fi
return 0
}
close_persistent_media () {
local device=${1}
local backing="$(where_is_mounted ${device})"
if [ -d "${backing}" ]
then
umount "${backing}" >/dev/null 2>&1
rmdir "${backing}" >/dev/null 2>&1
fi
if is_active_luks_mapping ${device}
then
/sbin/cryptsetup luksClose ${device}
fi
}
open_luks_device ()
{
dev="${1}"
name="$(basename ${dev})"
opts="--key-file=-"
if [ -n "${PERSISTENT_READONLY}" ]
then
opts="${opts} --readonly"
fi
if /sbin/cryptsetup status "${name}" >/dev/null 2>&1
then
re="^[[:space:]]*device:[[:space:]]*\([^[:space:]]*\)$"
opened_dev=$(cryptsetup status ${name} 2>/dev/null | grep "${re}" | sed "s|${re}|\1|")
if [ "${opened_dev}" = "${dev}" ]
then
luks_device="/dev/mapper/${name}"
echo ${luks_device}
return 0
else
log_warning_msg "Cannot open luks device ${dev} since ${opened_dev} already is opened with its name"
return 1
fi
fi
load_keymap
while true
do
/lib/cryptsetup/askpass "Enter passphrase for ${dev}: " | \
/sbin/cryptsetup -T 1 luksOpen ${dev} ${name} ${opts}
if [ 0 -eq ${?} ]
then
luks_device="/dev/mapper/${name}"
echo ${luks_device}
return 0
fi
echo >&6
echo -n "There was an error decrypting ${dev} ... Retry? [Y/n] " >&6
read answer
if [ "$(echo "${answer}" | cut -b1 | tr A-Z a-z)" = "n" ]
then
return 2
fi
done
}
get_gpt_name ()
{
local dev="${1}"
/sbin/blkid -s PART_ENTRY_NAME -p -o value ${dev} 2>/dev/null
}
is_gpt_device ()
{
local dev="${1}"
[ "$(/sbin/blkid -s PART_ENTRY_SCHEME -p -o value ${dev} 2>/dev/null)" = "gpt" ]
}
probe_for_gpt_name ()
{
local overlays="${1}"
local snapshots="${2}"
local dev="${3}"
local gpt_dev="${dev}"
if is_active_luks_mapping ${dev}
then
# if $dev is an opened luks device, we need to check
# GPT stuff on the backing device
gpt_dev=$(get_luks_backing_device "${dev}")
fi
if ! is_gpt_device ${gpt_dev}
then
return
fi
local gpt_name=$(get_gpt_name ${gpt_dev})
for label in ${overlays} ${snapshots}
do
if [ "${gpt_name}" = "${label}" ]
then
echo "${label}=${dev}"
fi
done
}
probe_for_fs_label ()
{
local overlays="${1}"
local snapshots="${2}"
local dev="${3}"
for label in ${overlays} ${snapshots}
do
if [ "$(/sbin/blkid -s LABEL -o value $dev 2>/dev/null)" = "${label}" ]
then
echo "${label}=${dev}"
fi
done
}
probe_for_file_name ()
{
local overlays="${1}"
local snapshots="${2}"
local dev="${3}"
local ret=""
local backing="$(mount_persistent_media ${dev})"
if [ -z "${backing}" ]
then
return
fi
for label in ${overlays}
do
path=${backing}/${PERSISTENT_PATH}${label}
if [ -f "${path}" ]
then
local loopdev=$(setup_loop "${path}" "loop" "/sys/block/loop*")
ret="${ret} ${label}=${loopdev}"
fi
done
for label in ${snapshots}
do
for ext in squashfs cpio.gz ext2 ext3 ext4 jffs2
do
path="${PERSISTENT_PATH}${label}.${ext}"
if [ -f "${backing}/${path}" ]
then
ret="${ret} ${label}=${dev}:${backing}:${path}"
fi
done
done
if [ -n "${ret}" ]
then
echo ${ret}
else
umount ${backing} > /dev/null 2>&1 || true
fi
}
find_persistent_media ()
{
# Scans devices for overlays and snapshots, and returns a whitespace
# separated list of how to use them. Only overlays with a partition
# label or file name in ${overlays} are returned, and ditto for
# snapshots with labels in ${snapshots}.
#
# When scanning a LUKS device, the user will be asked to enter the
# passphrase; on failure to enter it, or if no persistent partitions
# or files were found, the LUKS device is closed.
#
# For a snapshot file the return value is ${label}=${snapdata}", where
# ${snapdata} is the parameter used for try_snap().
#
# For all other cases (overlay/snapshot partition and overlay file) the
# return value is "${label}=${device}", where ${device} a device that
# can mount the content. In the case of an overlay file, the device
# containing the file will remain mounted as a side-effect.
#
# No devices in ${black_listed_devices} will be scanned, and if
# ${white_list_devices} is non-empty, only devices in it will be
# scanned.
local overlays="${1}"
local snapshots="${2}"
local white_listed_devices="${3}"
local ret=""
for dev in $(storage_devices "" "${white_listed_devices}")
do
local result=""
local luks_device=""
# Check if it's a luks device; we'll have to open the device
# in order to probe any filesystem it contains, like we do
# below. activate_custom_mounts() also depends on that any luks
# device already has been opened.
if echo ${PERSISTENT_ENCRYPTION} | grep -qe "\<luks\>" && \
is_luks_partition ${dev}
then
if luks_device=$(open_luks_device "${dev}")
then
dev="${luks_device}"
else
# skip $dev since we failed/chose not to open it
continue
fi
elif echo ${PERSISTENT_ENCRYPTION} | grep -qve "\<none\>"
then
# skip $dev since we don't allow unencrypted storage
continue
fi
# Probe for matching GPT partition names or filesystem labels
if echo ${PERSISTENT_STORAGE} | grep -qe "\<filesystem\>"
then
result=$(probe_for_gpt_name "${overlays}" "${snapshots}" ${dev})
if [ -n "${result}" ]
then
ret="${ret} ${result}"
continue
fi
result=$(probe_for_fs_label "${overlays}" "${snapshots}" ${dev})
if [ -n "${result}" ]
then
ret="${ret} ${result}"
continue
fi